EV charger load in Australian electrical planning
How EV charger kW, current, phase arrangement, load management and maximum demand fit together in Australia.
What EV Charger Load Means
EV charger load is the load contribution associated with an EV charging circuit or charger. In Australian 230/400 V a.c., 50 Hz planning it may be described by kW, current, phase arrangement, operating mode and demand assumption.
The value can come from product rating, entered current, load-management settings or a project demand assumption. Those are not the same thing, so keep the source of the value visible before carrying it into a switchboard schedule or maximum-demand worksheet.
Current From Charger Rating
For a single-phase charger, a simple current estimate is I = kW x 1000 / (230 x pf). For a balanced three-phase charger, use I = kW x 1000 / (sqrt(3) x 400 x pf).
At power factor 1, a 7.4 kW single-phase charger is about 7400 / 230 = 32.2 A. An 11 kW three-phase charger is about 11000 / (sqrt(3) x 400) = 15.9 A per line. A 22 kW three-phase charger is about 22000 / (sqrt(3) x 400) = 31.8 A per line.
| Input | Use it for | Why it matters |
|---|---|---|
| Charger rating | kW, A or product rating. | Load contribution depends on the rating source. |
| Phase arrangement | Single-phase or three-phase. | Current conversion changes with phase. |
| Voltage basis | 230 V or 400 V a.c. where applicable. | The formula needs the correct Australian supply basis. |
| Power factor | Entered assumption or product value. | Apparent current changes when power factor changes. |
| Load management | Fixed, managed or conditional load limit. | Demand contribution may differ from nameplate rating. |
Maximum-Demand Context
EV chargers can be substantial loads, but charger rating is not automatically the final maximum demand. The demand value depends on the project method, other loads, load-management basis and any DNSP or supply condition that affects the project.
| Case | Example value | Where it goes next |
|---|---|---|
| Single-phase charger | 7.4 kW at 230 V, about 32.2 A at pf 1. | Load-current or EV charger load calculator. |
| Mid-size three-phase charger | 11 kW at 400 V, about 15.9 A per line at pf 1. | EV charger load calculator and phase-loading review. |
| Three-phase charger | 22 kW at 400 V, about 31.8 A per line at pf 1. | EV charger load calculator and load schedule. |
| Managed charger | Nameplate rating plus managed-load limit. | Maximum-demand worksheet with the control basis visible. |
| Network-sensitive site | DNSP area, import capacity or application condition. | DNSP connection context before final planning. |
Australian Planning Notes
Use 230/400 V a.c. context only where it matches the charger and project value. Keep charger product data, load-management assumptions and DNSP conditions visible when they affect current or maximum-demand planning.
For shared switchboards, keep other major loads visible beside the charger contribution. That prevents one EV value from standing in for the whole demand review.
Next checks
- Use EV charger load for entered charger rating, phase arrangement and contribution basis.
- Use load current when a kW value first needs conversion to current.
- Use maximum demand when the EV value becomes one row in a wider demand worksheet.
- Use the DNSP connection context table when network limits or application status affect the project.
Boundaries
- This page does not approve an EV installation.
- It does not choose cable, protection or load-management settings.
- Product data, DNSP conditions, project requirements and licensed electrical work remain controlling inputs.